PLANET CS-2001 - Manual (Page 377)

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Step 11. Go to Policy > Incoming, click New Entry and then set as below:
（Figure 11-247）
 Select the defined Trunk from the VPN Trunk drop-down list.
 Click OK.
（Figure 11-248）
Figure 11-247 Configuring an Incoming Policy
Figure 11-248 Setting Completed